他注意到，直接用手调节收音机的旋钮来调整声音要比按住专用按钮再说“收音机——调大音量”要来得快得多。
It is much quicker to turn up the radio's volume control by hand than it is to press a special button and say "radio-raise volume," he notes.
他们有两个窗口和一些旋钮，或到处都是按钮。
They have two Windows and a few knobs or pushbuttons here and there.
前面板可以包括旋钮、按钮、图形和许多其他的控件（用户输入）以及指示器（程序的输出）。
The front panel can contain knobs, push buttons, graphs, and many other controls (which are user inputs) and indicators (which are program outputs).
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